iii. guidelines on missions for adoption by the Commission; g) Present a written report to the Commission at the beginning of each session on the activities of the Secretariat since the preceding session; h) Implement the decisions entrusted to him or her by the Commission or the Bureau; i) Make available to the general public documents which are not confidential, including States Reports, by ensuring that they are posted on the website of the Commission; j) Ensure the maintenance and regular updating of the website of the Commission; k) Assess the performance of the staff of the Commission. Rule 19 Financial Responsibility The expenses of the Commission, emoluments and allowances for Commissioners and the budget of the Secretariat, shall be borne by the African Union, in accordance with criteria laid down by the African Union in consultation with the Commission. Rule 20 Financial Rules The implementation of provisions of Articles 41 and 44 of the Charter shall be governed by the African Union's Financial Rules. Rule 21 Estimate When the Commission considers a proposal entailing expenses, the Secretary shall prepare and present to the members of the Commission, as soon as possible, a report outlining the financial implications of the proposal. Rule 22 Confidentiality of the Work of the Commission The staff of the Secretariat must observe the principle of confidentiality in all matters that the Commission considers confidential as stipulated under the Charter and these Rules. Chapter V Subsidiary Mechanisms Rule 23 Special Rapporteurs, Committees and Working Groups 1. The Commission may create subsidiary mechanisms such as special rapporteurs, committees, and working groups. 2. The creation and membership of such subsidiary mechanisms may be determined by consensus, failing which, the decision shall be taken by voting. 3. The Commission shall determine the mandate and the terms of reference of each subsidiary mechanism. Each subsidiary mechanism shall present a report on its work to the Commission at each ordinary session of the Commission. Rule 24 Applicable Rules for Subsidiary Mechanisms The Rules of Procedure of the Commission shall apply mutatis mutandis to the proceedings of its subsidiary mechanisms. Chapter VI Sessions Rule 25 General Principles 1. The Commission shall hold Ordinary and Extraordinary Sessions, to enable it to satisfactorily carry out its functions in conformity with the African Charter. 2. Sessions of the Commission shall be held in public unless the Commission decides otherwise or if it appears from the relevant provisions of the Charter that the meeting shall be held in private. Rule 26 Ordinary Sessions 1. The Commission shall hold at least two Ordinary Sessions per year each lasting for about two weeks, unless the Commission decides otherwise. 2. The Ordinary Sessions of the Commission shall be convened on a date fixed by the Commission upon the proposal of its Chairperson and in consultation with the Chairperson of the African Union Commission. 3. In exceptional circumstances, the Chairperson of the African Union Commission may change the opening date of a session, in consultation with the Chairperson of the Commission. 5